Our lightest sub-zero down jacket. A 'K Series' product. Warmth to weight at the limit of possibilities for extra-keen lightweight backpackers and mountain racers. Now also available in custom sizes.

Typical Operating Temperature

Guideline minimum temperature. Sleeping Bag TOT: you should get a night’s sleep, under normal circumstances. Clothing TOT: you should feel warm enough, assuming low/moderate activity. Sleep System TOT: relates to full system. For more details, see our Technical Briefing.

-5°C / 23°F

Weight

For clothing, weight is for size: M. For sleeping bags, weight changes with selected length/width. N.B. there may be some variation in the weights of finished products.

240g / 8oz

Price

£413.00

Qty:

The sensation of immediate warmth is unsurpassed. The 1000-fill is so high-lofting, it puffs up as if a pump has been attached. Rare and wonderful.Judy Armstrong in TGO Magazine. Read full review.

Sizing

Standard Sizing

The PHD Sizing Chart below is based on measurements without clothing, exactly the way you would buy a shirt or a sweater. A 42" (107cm) chest means that your bare chest uninflated measures 42". Inside Arm is measured from armpit to wrist-bone.

Size

Height

Chest

Waist

Inside arm

XS

155-163cm(5'1"–5'4")

86cm(34")

71cm(28")

46cm(18")

S

164-170cm(5'5"–5'7")

91cm(36")

76cm(30")

48cm(19")

M

171-178cm(5'7"–5'10")

99cm(39")

84cm(33")

51cm(20")

L

179-186cm(5'10"–6'1")

107cm(42")

91cm(36")

53cm(21")

XL

187-193cm(6'2"–6'4")

114cm(45")

99cm(39")

56cm(22")

Custom Sizing

Once you've selected a Body Width you can choose Body Length and Arm Length up to two sizes bigger or smaller. For example, a jacket with a medium (M) Body Width can be XS, S, M, L, or XL in Body Length and XS, S, M, L, or XL in Arm Length. If you have any questions about your size, please contact us.

Body Width. Use the chart below to find your Body Width. Measure yourself without clothes, relaxed with an uninflated chest.

Body Width

Chest circumference

Waist circumference

XS

86cm (34")

71cm (28")

S

91cm (36")

76cm (30")

M

99cm (39")

84cm (33")

L

107cm (42")

91cm (36")

XL

114cm (45")

99cm (39")

Body Length -- can be two sizes up or down from Body Width. Use the chart below to find your Body Length size. Measure your height without shoes:

Body Length Size

Your height in cm

Your height in inches

XXXS

139 - 144cm

4'5" - 4'8"

XXS

145 - 154cm

4'9" - 5'

XS

155 - 163cm

5'1" - 5'4"

S

164 - 170cm

5'5" - 5'7"

M

171 - 178cm

5'7" - 5'10"

L

179 - 186cm

5'10" - 6'1"

XL

187 - 193cm

6'2" - 6'4"

XXL

194 - 201cm

6'4" - 6'7"

XXXL

202 - 209cm

6'8" - 6'10"

Inside Arm -- can be two sizes up or down from Body Width. Inside Arm is measured from armpit to wrist-bone without clothes. When you measure your inside arm let your arm hang loosely by your side. Don't extend it horizontally.

Inside Arm

cm

Inches

XXXS

41cm

16"

XXS

43cm

17"

XS

46cm

18"

S

48cm

19"

M

51cm

20"

L

53cm

21"

XL

56cm

22"

XXL

58cm

23"

XXXL

61cm

24"

N.B. PHD clothing is unisex.

Notes:

Down Jackets are sized to fit over thermal underwear & fleece.

Shell Jackets are sized to fit over thermal underwear & fleece or light down clothing (e.g. Minimus Jacket): to cover thick down clothing, go up one size.

The arms of our outdoor jackets are designed to be long enough to keep your wrists warm when your arms are extended horizontally (when using trekking poles, for example) or when you are reaching above yourself (when climbing, for example). In this respect the arm lengths of our jackets differ from street/fashion jackets.

*Please note: We make our stuff sacs big enough to allow fairly easy stuffing rather than reducing the jacket to the tightest minimum.

Description:

This K Series product has been created for one single reason, to take warmth-for-weight performance to the limit of what's possible. Unique 1000 down, super-light materials, and specific design features mean that the word Ultralight now applies to this wide range of gear that will take you to the Poles as well as on a Sahara Marathon. More on the K Series...

This jacket is now also available in custom sizes. Specify Body Width, Body Length, and Arm Length independently to order a made-to-measure down jacket. This tailor-made service can cope with sizes from XXXS to XXXL and is ideal if your chest/waist to height and/or arm ratios differ from standard, ready-to-wear patterns.

1000 down and 10X inner, the exceptional lightweight components of the K Series, have allowed us to make a down jacket at 240gm (8oz) which weighs less than most down vests. But make no mistake, this Ultra Jacket is a piece of real outdoor kit: the 1000 down gives surprising warmth inside the highly water-resistant and windproof Ultrashell outer.

Please note: If you order a custom-sized version of this jacket it will take longer (approximately 45 days) to be manufactured ready for dispatch. Custom-sized versions of this jacket are not returnable and customer loyalty discount cannot be applied.

Technical info

Ultrashell (weight: 40 gsm)

One of the lightest of PHD's coated materials. This ripstop nylon provides complete wind block and good water resistance at minimal weight. Ultrashell gives an excellent upgrade to performance with very little weight penalty.

Ultralight 10X fabric (weight: 26 gsm)

10X, PHD's first 10 Denier Fabric. 9,000 metres of the yarn used to weave 10X weighs just 10g, that's about the same as a £1 coin! For all its thinness 10X is amazingly downproof and with reasonable care will go on giving you good service for years.

1000 fillpower down

This rarest of all downs we reserve for the K Series. European goose down of unique quality. 1000 provides the highest warmth-for-weight performance possible from down. More on our down insulation.

Reviews

"The sensation of immediate warmth is unsurpassed. The 1000-fill is so high-lofting, it puffs up as if a pump has been attached; this is enhanced by wide baffles, which allow the down to expand so quickly. Weight is kept to a minimum through simple but effective design. Overall it was a dream to wear. PHD is the only company in the world using 1000-fillpower down in clothing and sleeping bags for expeditions and mountaineering: rare, indeed, and wonderful."
— Judy Armstrong in TGO Magazine. Read full review.

"Your kit is AMAZING !! Wow - very impressed. I'm a really cold person but even on my own in a tent at -8°C I was comfortably warm. It's also incredibly light. So light, the organisers made me take extra items to MAKE UP weight in my bag!"
— Rebecca Ferry, using the Jacket in the Everest Trail Race, where she came in 4th in the women's race.